If you want to clone the structure, the clone application is the least hassle way of doing it as it's just fire & forget. The USB is bulk, not isochronous - iso is used only for things like softmodems, speakers, etc.

The permanent feed means that there is no need for a de-thump circuit. One thing you may come across is that there's no ground on the serial connector due to a slight oversight (oops) - and as the cables are custom moulded, we can't change this. Just make sure your attached device uses car ground and there will be no problems.

Ethernet is only 10mbit as the SA1100 doesn't have external DMA and even though there are 100mbit chips which will run DMA-less, it's really not worth the hassle.

Hugo